Hold the middle button for 2 seconds.
Steps
- Hold the middle button for 2 seconds.
- Double press the middle button to see the battery level.
If it doesn't work
- UNIT-4 stays off. Plug the power supply into the socket on the back and into the mains. Hold the middle button for 2 seconds again.
- UNIT-4 charges by USB-C. UNIT-4 (Model: MKI) charges by DC. Please follow the steps in How do I charge UNIT-4?
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